Drug interactions
Carbamazepine + Pimozide
Severity: Major
Carbamazepine and Pimozide: major interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Carbamazepine strongly induces CYP3A4 and can lower pimozide plasma concentrations, potentially reducing its efficacy in Tourette disorder or psychosis. Loss of control may occur, and stopping carbamazepine can later cause pimozide levels to rise with a risk of QT prolongation.
What this interaction means in plain words
Carbamazepine and Pimozide can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Carbamazepine belongs to Central Nervous System; Pimozide belongs to Central Nervous System.
Why it happens
Induction of CYP3A4-mediated pimozide metabolism by carbamazepine.
What to do
Monitor clinical response and adjust the pimozide dose as needed. When carbamazepine is started or stopped, reassess pimozide dosing and obtain an ECG.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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Other interactions of Pimozide
- Adagrasib + Pimozide Contraindicated
- Amiodarone + Pimozide Contraindicated
- Amisulpride + Pimozide Contraindicated
- Amitriptyline + Pimozide Contraindicated
- Amoxapine + Pimozide Contraindicated
- Anagrelide + Pimozide Contraindicated
Other interactions of Carbamazepine
- Artemether / lumefantrine + Carbamazepine Contraindicated
- Cabotegravir + Carbamazepine Contraindicated
- Carbamazepine + Delamanid Contraindicated
- Carbamazepine + Dienogest / estradiol valerate Contraindicated
- Carbamazepine + Doravirine Contraindicated
- Carbamazepine + Elbasvir / grazoprevir Contraindicated
Frequently asked questions
Can I take Carbamazepine with Pimozide?
MediHelp rates the interaction as major. Carbamazepine and Pimozide can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Carbamazepine strongly induces CYP3A4 and can lower pimozide plasma concentrations, potentially reducing its efficacy in Tourette disorder or psychosis. Loss of control may occur, and stopping carbamazepine can later cause pimozide levels to rise with a risk of QT prolongation.
How serious is the interaction between Carbamazepine and Pimozide?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor clinical response and adjust the pimozide dose as needed. When carbamazepine is started or stopped, reassess pimozide dosing and obtain an ECG.
What other medicines interact with Pimozide?
MediHelp also lists interactions of Pimozide with, for example, Adagrasib, Amiodarone, Amisulpride. The full list is on the Pimozide page.
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